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(No Model.)

H. J. MULLER. 'BLBGTROPLATING CIRCUIT. Y No. 245,206. y PatentedKAugI 2.1881.

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BY A l ATTORNEYS.

"UNITED STATES PATENT OFFICE.

'1. `nANs J; MLLEaYoF NEwT YORK, N. Y., AssrGNoE To HrMsELE AND ALEXANDER LEvErr, E sAME PLAGE.

ELECTROPLATING-ClRoni-r.

sPEcrFrcArroNfferming part ef Lettere Patent 110,245,206, dated August 2, 1881.

` n Applicationfiled May2l, l1881. Y(No model.)

Aline which leads from apiece of `carbon or other electric conducting material to the inner positive end of the magnet-'wire or to a post connected with the said end of the magnet-wire.

In the accompanying drawings a diagram of my improved platin g-circuit is shown.

A short description of this improved electroplatng-circuit is given in my patent, No. 241,053, on dynamo-electric machines, dated May'3, 1881; but I did not claim the invention at the time, as it was to be the subject-matter of a separate application.

The magnets, the armature-coils,- the binding-postsFl F2,`the binding-posts V and W, for the negative line X' and positive line X2, respectively, leading to the bath', and the relaymagnet, resistance, and connections are all arranged as shown and described in the abovenamed patent. From the binding-post F', to which the inner `positive end of the magnetwire is attached, a wire, 1/,l or separate line leads to a piece of carbon, z", or other electric conductor in the bath C; The piece of carbonv z' is clamped by a piece of metal, a, to which the wire y is attached. This metal clamp a and the wire y, as far as it is immersed in the solution, is surrounded by a thick coating or layer, d, of gutta-percha, rubber, waX,-&c., or other materialthat isinsulating, and at the same time liquid-proof. It'A desired, the wire y can be connected directly with the inner positive end of the magnet-wire; but I prefer the construction described above. Any kind of dynamo-electric plating-machine can be used; but preferably a machine with a protector to guard against the secondary current is used. This separate line is indispensable, as the circuit could not otherwise be completed when there is no work in the bath. As is well known, a secondary current is produced in the cyanide solution or bath, and` this secondary current discharges itself when but a small quantity of work is left in the bath and the polarity of the dynamo-electric machine is reversed. If all the work is removed from the bath and the machineand the bath are not connected by the separate line y-the secondary current will not be discharged, but remains in the bath until fresh work is placed therein, and the moment the work is introduced the current is discharged and reverses the polarity of the machine, it the protecting-relayis notprovided, or if it is inoperative; but if the machine and the bath are connected by a separate line, described above, the circuits will be changed considerably, for in this case the secondary current will be discharged as soon as all the work is removed, and the .bath will be neutral when fresh work is placed into it. The circuit of this secondary current will be chan ged accordingly if the machine is provided with a protecting-relay or not.

It the machinelis not provided with a pro` tecting-relay, or if this protecting-relay is inoperative, (which amounts tothe same thing,) the circuit of the secondary current is as follows: From the anode m to the binding-post W, binding-post F2, brusher O, commutator K,

- brusher N, post F', separate line-y, to the bath that is, the Vsecondary current will be discharged as soon as the work is removed from the bath andthe bath is neutral. If the separate line had not been provided the secondary current would have been discharged through the field-magnets, and the polarity of the machine would have been reversed, as described above; but if the machine is provided with an operative protecting-relay the secondary current will pass through the magnets, as described in Patent No. 241,053 5 for although the magnet-wires are much longer than those of the armature, they are also thicker, and thus present less resistance, and consequently the current passes through them and not through the armature. A small part ot the primary or working current passes from the anode directly to the carbon z', and for that reason this piece of carbon must not be too large, for otherwise the quantity of work performed will be less and the field-magnets will he affected.

If the circuits are followed on the. diagram it will he seen that the part ofthe primary or Working' current that passes from the anode to the carbon will encounter the primary current coming; from the Licht-magnets between the post F and the field-magnets. This small part of the main current is carried along by the greater part of this cnirent, (coming from the magnets,) and consequently this small partof the current is lost-that is, it cannot be used to excite the ieldmagnets. Therefore, if the carbon z is not very large, only a small quantity of the primary current will he lost; but such a small piece of carbon will always answer for the secondary current, the intensity lent attached to thc hath end ot' this separate 3o line7 substantially as herein shown and described, and for the purpose set forth.

HANS J. MULLER. Witnesses:

OSCAR F. Gonz, C. SEDGWICK. 

